atacaks:
As an aside note: is there any material (here on elsewhere, haven't manage to google it) describing the design decision (and expected gain) of not having feedback built in the T/L mechanism ?
Educated guesses here, but I'd imagine something like:
- Less weight
- FADEC does not require direct cable connection to the engine anyway
- Fewer moving parts to go wrong
for starters.
I read a while ago about a glitch in the FADEC software for the 777 that caused a reduction in thrust at takeoff. None of the articles I read mentioned whether the levers moved or not in that situation, but that the pilots initially saw it as a significant drop in N1.
In the case of this incident though, it would appear the FADEC was doing exactly as the TL positions requested.